package com.rentplant.controller;

import com.rentplant.utils.RequestUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.annotations.Param;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;


@Slf4j
@RestController
@RequestMapping("/image")
public class upLoadImage {

    @Value("D:\\springbootrent\\src\\main\\java\\com\\rentplant\\image\\")
//    @Value("D:\\rent\\demo1\\src\\main\\java\\com\\nursinghome\\demo1\\image\\")
    private String basePath;

    /**
     * 文件上传
     *
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public RequestUtils<String> upload(MultipartFile file) {
        System.out.println(file);
        log.info(String.valueOf(file));
        // 原始文件名
        String originalFilename = file.getOriginalFilename();
        // 取出后缀
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        // 使用UUID重新生成文件名,防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID() + suffix;

        // 创建一个目录对象
        File dir = new File(basePath);
        // 判断当前目录是否存在
        if (!dir.exists()) {
            // 目录不存在,需要创建
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return RequestUtils.success(fileName);
    }

    /**
     * 文件下载
     *
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(@Param("name") String name, HttpServletResponse response) {
        try {
            // 输入流,通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            // 输出流,通过输出流将文件写回浏览器,在浏览器展示图片了
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }

            // 关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
